Testing equipment for air compressor dryer unit of maglev train

Abstract

The invention provides test equipment for a dryer unit of an air compressor of a maglev train, and the equipment comprises a first air storage tank which is connected to an air source output interface of a to-be-tested dryer and is used for receiving dry air discharged from the air source output interface; one end of the second air storage tank is connected to an air source input interface of the tested dryer, the other end of the second air storage tank is connected to an air inlet valve for introducing dry air and a humidifying and atomizing nozzle valve for introducing wet air, and the air inlet valve and the humidifying and atomizing nozzle valve are arranged in parallel; the tested dryer is provided with a water vapor discharge interface; and after the humidification atomization nozzle valve introduces wet gas into the second gas storage tank, the gas inlet valve introduces dry gas into the second gas storage tank. And the working environment of the dryer under real working conditions can be simulated. And whether the dryer can normally complete adsorption and regeneration processes and discharge moisture under the condition that the adsorbed moisture is nearly saturated is verified, so that the performance of the dryer is more accurately and comprehensively tested, and the test reliability is improved.

Description

Technical Field

[0001] The invention relates to a testing device for a maglev train air compressor dryer unit. Background Art

[0002] Maglev trains rely on air compressors to provide compressed air for a variety of key systems, such as the braking system, suspension system, and door control system. The moisture and impurities contained in the compressed air can cause serious damage to these systems, such as corroding pipes, reducing braking efficiency, and affecting suspension stability. Therefore, a dryer is usually equipped in the air compressor system to remove moisture and impurities in the compressed air to ensure the reliability and safety of the system.

[0003] At present, most of the dryers used on the air compressors of maglev trains are double-tower adsorption dryers, whose core components are two adsorption cylinders (referred to as cylinder A and cylinder B) and a switching valve. Desiccant is usually filled in the adsorption cylinder to adsorb moisture in the compressed air. The two adsorption cylinders alternately perform adsorption and regeneration processes to achieve continuous drying function.

[0004] The working principle of the tested dryer is as follows: During the adsorption stage, undried compressed air enters one of the adsorption cylinders (e.g., cylinder A) from the switching valve. The desiccant (e.g., activated alumina or molecular sieve) filled in the adsorption cylinder will adsorb the moisture in the compressed air, thereby outputting dry compressed air. Part of the dried air is supplied to the train system, and the other part is used to regenerate another adsorption cylinder.

[0005] During the regeneration phase, while cylinder A is adsorbing, a portion of the dry compressed air will flow through the throttle valve into another adsorption cylinder (such as cylinder B), and reversely purge cylinder B at a lower pressure to take away the adsorbed moisture. This process is called regeneration. The regenerated gas, which contains the moisture purged from the desiccant, will be discharged through the drain port of the switching valve.

[0006] The adsorption and regeneration processes are switched periodically. When cylinder A is saturated with adsorption and needs to be regenerated, the switching valve will switch the gas path so that cylinder B enters the adsorption stage and cylinder A enters the regeneration stage. The switching action of the switching valve is usually controlled by a timer control board, for example, switching once every minute. The specific working principle of the switching valve is as follows: When cylinder A is adsorbing, switching valve A is in the open state, switching valve B is in the closed state, and compressed air enters cylinder A from switching valve A. A part of the dried compressed air enters cylinder B through the throttle valve for regeneration, and the regenerated gas is discharged from the drain below switching valve B. When the timer ends, the control signal drives the switching valve to operate. Switching valve A is closed and switching valve B is opened. Compressed air begins to enter cylinder B from switching valve B for adsorption, while cylinder A enters the regeneration stage, and the regenerated gas is discharged from the drain below switching valve A.

[0007] The continuous cycle of the above adsorption and regeneration process ensures that the dryer can continuously provide dry compressed air.

[0008] However, the existing dryers and test methods thereof have the following technical problems:

[0009] Inadequate dryer durability testing: Traditional testing methods usually install the dryer on an air compressor for testing, which is short and cannot fully evaluate the long-term performance and reliability of the dryer. For example, a 30-minute test is equivalent to only 30 switches of the dryer, while in actual operation the dryer may need to work for several hours a day and perform hundreds of switches. This inadequate testing can cause dryers to fail in long-term operation, affecting the normal operation of the train system.

[0010] Residual moisture in the dryer cavity: After the test is completed, moisture is likely to remain inside the dryer cavity, especially in the switching valve cavity. This residual moisture will corrode the parts, causing the dryer performance to deteriorate or even fail. Traditional testing methods do not have effective measures to solve this problem.

[0011] The electrical signal test of the dryer is complicated: the dryer usually needs to connect multiple electrical signals, such as power input, pressure switch input, fan power output, etc. The traditional test method requires the dryer to be installed on the air compressor for testing. The wiring is complicated and prone to errors. In addition, once an electrical signal failure occurs, it is difficult to quickly locate the fault point.

[0012] Inaccurate test of dryer drainage function: Traditional test methods make it difficult to accurately control the moisture content entering the dryer, resulting in inaccurate drainage function test results and difficulty in evaluating the actual drainage performance of the dryer.

[0013] Low dryer testing efficiency: The traditional testing method requires the dryer to be installed on the air compressor for testing. The installation and disassembly process is cumbersome and time-consuming, which reduces the testing efficiency. Summary of the invention

[0014] The present invention aims to solve the above technical problems and provide a test device for the maglev train air compressor dryer unit that can conduct comprehensive, efficient and accurate testing of the dryer, especially to solve the problems of insufficient durability testing of the dryer and residual moisture in the cavity. By providing an independent test platform, the dryer can be tested for durability for a long time, and the residual moisture in the cavity can be effectively removed by the automatic purge function, thereby improving the reliability and service life of the dryer.

[0015] The present invention solves the above technical problems by the following means: a test device for a maglev train air compressor dryer unit, comprising: a first air storage tank, the first air storage tank is connected to the air source output interface of the tested dryer, and is used to receive dry air discharged from the air source output interface; a second air storage tank, one end of the second air storage tank is connected to the air source input interface of the tested dryer, and the other end is connected to an air inlet valve for introducing dry air and a humidifying atomizing nozzle valve for introducing humidified gas, the air inlet valve and the humidifying atomizing nozzle valve are arranged in parallel; the tested dryer has a water vapor interface; after the humidifying atomizing nozzle valve introduces humidified gas into the second air storage tank, the air inlet valve introduces dry gas into the second air storage tank. It can simulate the working environment of the dryer under real working conditions. First, humid gas is introduced to simulate the entry of moisture in actual operation, so that the desiccant adsorbs moisture to a state close to saturation; then dry gas is introduced to simulate the normal drying process of the dryer and the regeneration process after adsorption saturation, to verify whether the dryer can normally complete the adsorption and regeneration process and discharge moisture when the adsorbed moisture is close to saturation, so as to test the performance of the dryer more accurately and comprehensively and improve the reliability of the test.

[0016] Preferably, one end of the second gas storage tank is connected to the air source input interface of the dryer to be tested through the first pressure switch, and the drainage steam interface is connected to the second pressure switch. The first pressure switch can simulate the pressure signal of the air compressor when it is working, trigger the timer control panel of the dryer, and thus simulate the working state of the dryer more realistically; the second pressure switch can detect the pressure of the drainage steam of the dryer to determine whether the drainage function is normal.

[0017] Preferably, the second pressure switch is associated with a counter, which is connected to the control box, and can record the number of times the dryer is exhausted, thereby quantitatively evaluating the drainage performance of the dryer and providing a basis for subsequent data analysis.

[0018] Preferably, the control box supplies power to the tested dryer and controls the switching valve of the tested dryer to switch the gas connection between the adsorption cylinders through the timing control board, so that the test equipment can automatically control the operation of the dryer, such as simulating the switching of the adsorption and regeneration processes, without manual operation, thereby improving the test efficiency and automation.

[0019] Preferably, the control box controls the gas connection between the adsorption cylinders through the timing control board to perform periodic switching at a set time, which can simulate the periodic switching process of the dryer in actual work and more accurately evaluate the long-term working performance and stability of the dryer.

[0020] Preferably, when the measurement is finished, the control box controls the first gas storage tank and the second gas storage tank to release the pressure. During this period, the control box controls the gas connection switch between the adsorption cylinders until the pressure drops to the set pressure value. The test can be safely ended to avoid the safety risks caused by excessive pressure, and by controlling the switching of the adsorption cylinders, the gas remaining in the dryer can be discharged, which is convenient for subsequent maintenance.

[0021] Preferably, the drainage steam interface is connected to the gas source output interface, and the capacity of the first gas tank is greater than that of the second gas tank. This is directly related to the proposed automatic purge solution. The larger capacity of the first gas tank can store more dry air after the test. When the dry air is replenished to the second gas tank, the dry air will flow through the dryer and finally enter the first gas tank, thereby achieving automatic purge and reducing the residual moisture inside the dryer.

[0022] Preferably, the drainage steam interface is connected to the gas source output interface, and the conduction pressure of the first pressure switch is lower than the conduction pressure of the second pressure switch. This ensures that when the dryer is working normally, the second pressure switch will be triggered only after the pressure of the drainage steam reaches a certain value, thereby avoiding misjudgment of the drainage function.

[0023] Preferably, the air inlet valve and the humidification atomizing nozzle valve arranged in parallel are both connected to an air inlet, and the air inlet outputs air to the air inlet valve and the humidification atomizing nozzle valve, thereby simplifying the air circuit design, facilitating operation, and sharing an air inlet, thereby reducing the volume and cost of the test equipment.

[0024] Preferably, the tested dryer is mounted on a dryer fixing bracket, the first gas storage tank is mounted on a test equipment bottom plate, and the test equipment bottom plate is fixed to the dryer fixing bracket, thereby improving the stability and reliability of the test equipment and facilitating the installation and removal of the dryer.

[0025] The present invention cleverly simulates the adsorption saturation state that the dryer may encounter in actual work by stipulating the sequence that the humidification atomizing nozzle valve introduces humid gas into the second gas tank and then the air inlet valve introduces dry gas into the second gas tank, and verifies whether it can still effectively adsorb and regenerate and discharge moisture in a state close to saturation. This test method is closer to the actual working conditions than the traditional test method, and can more accurately evaluate the performance of the dryer, thereby improving the reliability of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 The figure is a schematic structural diagram of a test device for a maglev train air compressor dryer unit according to an embodiment of the present invention.

[0027] Figure 2It is a schematic structural diagram of a control box according to one embodiment of the present invention. DETAILED DESCRIPTION

[0028] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings.

[0029] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the structures shown in the accompanying drawings are only schematic and do not constitute any limitation to the present invention.

[0030] Figure 1 The figure is a schematic structural diagram of a test device for a maglev train air compressor dryer unit according to an embodiment of the present invention. Figure 2 FIG. 1 is a schematic diagram of the structure of a control box according to an embodiment of the present invention. Figure 1 As shown, the present invention discloses a test device for a maglev train air compressor dryer unit, which mainly includes a first air storage tank 29, a second air storage tank 9, a dryer 21 to be tested, an air intake valve 4, a humidifying atomizing nozzle valve (composed of a stop valve 5, a humidifying atomizing nozzle 6, a stop valve 7 and an external water storage container 8), and a pipeline distributor 12 connecting the first air storage tank 29 and the dryer 21 to be tested.

[0031] The first air storage tank 29 is connected to the air source output interface B of the tested dryer 21 through a pipeline, and is used to receive the dry air discharged from the air source output interface B. The first air storage tank 29 has a volume of 5L and a cylindrical shape. A drain valve 30 and a muffler 31 are provided at the bottom, and a digital pressure gauge 28 is provided on the top to display the pressure in the tank.

[0032] One end of the second gas tank 9 is connected to the gas source input interface A of the dryer 21 under test through a pipeline, and the other end is connected to the air inlet valve 4 and the humidifying atomizing nozzle valve through pipelines. The air inlet valve 4 and the humidifying atomizing nozzle valve are arranged in parallel, and are both connected to the air inlet 3 through a pipeline. The air inlet 3 is used to replenish dry air from an external dry air source. The volume of the second gas tank 9 is 3L, and the shape is cylindrical. A drain valve 10 and a muffler 11 are arranged at the bottom. After the humidifying atomizing nozzle valve introduces humidified gas into the second gas tank 9, the air inlet valve 4 introduces dry gas into the second gas tank 9. This sequence can simulate the working conditions from humidification to dryness that the dryer may encounter in actual work, so as to test the performance of the dryer more comprehensively. For example, a certain amount of humidified gas can be first introduced into the second gas tank 9 through the humidifying atomizing nozzle valve to simulate the state where the adsorbent adsorbs moisture close to saturation after the dryer has been working for a long time. Then, close the humidification atomizing nozzle valve, open the air inlet valve 4, and introduce dry gas into the second air storage tank 9 to simulate the adsorption and regeneration process of the dryer. By observing the working state and drainage of the dryer, the performance of the dryer under different working conditions can be more accurately evaluated.

[0033] Further, one end of the second gas storage tank 9 is connected to the gas source input interface A of the tested dryer 21 through the first pressure switch 13. The drainage steam interface C is connected to the second pressure switch 24. The first pressure switch 13 is installed on the pipeline distributor 12, and its conduction pressure is set to 0.8 bar. When the pressure in the second gas storage tank 9 reaches 0.8 bar, the first pressure switch 13 is turned on, sends a signal to the control box 15, triggers the timer control board of the dryer 21 to start working, and controls the switching valve to switch periodically. The second pressure switch 24 is installed on the pipeline of the drainage steam interface C of the dryer 21, and its conduction pressure is set to 2.0 bar. When the pressure of the drainage steam of the dryer reaches 2.0 bar, the second pressure switch 24 is turned on, and sends a signal to the control box 15 to record the number of times the dryer is exhausted. The setting of these two pressure switches can more accurately control and monitor the test process of the dryer and improve the reliability of the test results. In other embodiments, the first pressure switch 13 can also directly connect the conduction signal to the timer control board of the dryer 21.

[0034] Further, if Figure 1 , 2 As shown, the second pressure switch 24 is associated with a counter 18, and the counter 18 is connected to the control box 15. The counter 18 is used to record the number of exhausts of the dryer 21. Each time the second pressure switch 24 is turned on, the count value of the counter 18 is increased by 1. The control box 15 can read the count value of the counter 18 and display it on the control panel, which is convenient for the tester to read and record.

[0035] Furthermore, the control box 15 supplies power to the dryer 21 under test, and controls the switching valve of the dryer 21 under test to switch the gas connection between the adsorption cylinders 22 and 23 through the timing control board. The control box 15 integrates a power module, a control circuit, and a display screen, etc., which can provide a 24V DC power supply to the dryer 21, and control the switching valve of the dryer 21 through a control signal to simulate the switching of the adsorption and regeneration processes. The front panel of the control box 15 is provided with a start switch 20, a digital display timer 17, a power indicator light 19, etc., which are convenient for testers to operate and monitor the test process.

[0036] Furthermore, the control box 15 controls the gas connection between the adsorption cylinders 22 and 23 to switch periodically at a set time, for example, switching once every 1 minute. This can simulate the periodic switching process of the dryer in actual work and more accurately evaluate the long-term working performance and stability of the dryer. The switching time can be set by the digital display timer 17 on the control box 15. In other embodiments, the following operation can also be performed: turn off the control switch toggle switch 20, then manually close the air inlet valve 4, and at the same time, discharge the pressure in the air storage tanks 9 and 29 through the stop valves 10 and 30.

[0037] Furthermore, when the measurement is finished, the control box 15 controls the first gas storage tank 29 and the second gas storage tank 9 to release the pressure. During this period, the control box 15 controls the gas connection switch between the adsorption cylinders 22 and 23 until the pressure drops to the set pressure value, such as 0.5 bar. This can safely end the test and avoid the safety risks caused by excessive pressure. By controlling the switching of the adsorption cylinders, the gas and moisture remaining in the dryer can be discharged, which is convenient for subsequent maintenance.

[0038] Furthermore, the drainage steam interface C is connected to the gas source output interface B, and the capacity of the first air tank 29 is greater than that of the second air tank 9. The capacity of the first air tank 29 is 5L, which is greater than the 3L of the second air tank 9. This realizes the automatic purge function of the present invention. After the drainage function test is completed, dry compressed air continues to be added to the second air tank 9 through the air inlet 3 and the air inlet valve 4 until the first air tank 29 reaches a preset pressure, such as 5 bar. Since the capacity of the first air tank 29 is larger, a large amount of dry air needs to be added to reach the preset pressure. These dry air will flow through the dryer 21 before entering the first air tank 29, and take away the residual moisture inside the dryer 21, especially the switching valve cavity, thereby realizing automatic purge, effectively solving the problem of residual water corroding parts, and improving the reliability and service life of the dryer.

[0039] Furthermore, the drainage steam interface C is connected to the gas source output interface B, and the conduction pressure of the first pressure switch 13 is less than the conduction pressure of the second pressure switch 24. The conduction pressure of the first pressure switch 13 is 0.8 bar, which is less than the conduction pressure of 2.0 bar of the second pressure switch 24. This ensures that when the dryer is working normally, the second pressure switch 24 will be triggered only when the pressure of the drainage steam reaches a certain value, thereby avoiding misjudgment of the drainage function.

[0040] Furthermore, the air inlet valve 4 and the humidification atomizing nozzle valve arranged in parallel are both connected to the air inlet 3, and the air inlet 3 outputs air to the air inlet valve 4 and the humidification atomizing nozzle valve. The air inlet 3 is a quick connection interface, which is convenient for connecting to an external air source. This parallel arrangement simplifies the air circuit design, facilitates operation, and can share one air inlet 3, reducing the volume and cost of the test equipment.

[0041] Further, the dryer 21 under test is mounted on the dryer fixing bracket 2 and fixed by fixing bolts 27. The first gas tank 29 and the second gas tank 9 are both mounted on the test equipment base plate 1, and the test equipment base plate 1 is fixed to the dryer fixing bracket 2 through a number of support columns (not shown in the figure) to form an integral test platform. The dryer fixing bracket 2 is an L-shaped structure, and forms a 90° angle with the test equipment base plate 1 to ensure the stability of the dryer 21 under test. This installation method improves the stability and reliability of the test equipment and facilitates the installation and removal of the dryer 21.

[0042] The specific test items and methods are as follows.

[0043] 1. Preparation before testing

[0044] Install the dryer under test: Place the dryer under test 21 on the dryer fixing bracket 2 and fix it firmly with the fixing bolts 27. Ensure that the dryer 21 is firmly installed to avoid movement or vibration during the test.

[0045] Connect the air source: Connect the external dry compressed air source to the air inlet 3 through the quick-connect interface. Make sure the connection is secure to avoid air leaks.

[0046] Connect the input and output cables to the control box:

[0047] Connect the 220VAC power cord to the power input interface 16 of the control box 15 .

[0048] Connect the 24VDC power output line of the control box 15 to the power input interface a of the dryer 21 under test.

[0049] The drainage count signal line of the control box 15 is connected to the second pressure switch 24 .

[0050] Connect the dryer gas line:

[0051] The output air pipe of the pipeline distributor 12 is connected to the air source input interface A of the dryer 21 to be tested.

[0052] The air input pipe of the first air storage tank 29 is connected to the air source output interface B of the dryer 21 to be tested.

[0053] The drainage steam interface C of the dryer 21 is connected to the second pressure switch 24 and the muffler 25 .

[0054] Connect the dryer signal cable:

[0055] The start pressure switch signal line b of the dryer 21 is connected to the first pressure switch 13 .

[0056] The 24 VDC power output line c of the dryer 21 is connected to the output indicator light 26 .

[0057] 2. Dryer function test

[0058] Pressurization preparation: Open the air inlet valve 4 and fill the second air tank 9 with dry compressed air. Observe the digital pressure gauge 14 to ensure that the pressure in the second air tank 9 reaches more than 5 bar. This step is to ensure that there is sufficient air supply during the test.

[0059] Start the test: Turn on the start switch 20 of the control box 15, and press the reset button of the counter 18 and the digital display timer 17 to reset the count value and timing. At this point, the dryer function test officially begins. The control box 15 will control the switching valve of the dryer 21 to switch periodically according to the preset program, for example, once every 1 minute. Observe whether the count value of the counter 18 is consistent with the number of switching times to verify whether the functions of the dryer timer control board and the switching valve are normal.

[0060] Stop the test: When the preset test time is reached, turn off the start switch 20 of the control box 15 and close the air inlet valve 4. Open the drain valve 10 of the second air tank 9 and the drain valve 30 of the first air tank 29 to release the pressure in the two air tanks until the pressure values ​​displayed by the pressure gauges 14 and 28 return to zero (to atmospheric pressure). In some embodiments, before turning off the start switch 20, the remaining air pressure in the first and second air tanks can be used to reach atmospheric pressure, and the switching valve can be operated multiple times to remove possible residual water vapor.

[0061] 3. Dryer drainage function test

[0062] Humidification preparation: Confirm that the pressure in the second air tank 9 is zero. Open the stop valves 5 and 7 to allow the water in the external water storage container 8 to enter the humidification atomizing nozzle 6 through siphon action and be sprayed into the second air tank 9 in the form of atomization. After adding an appropriate amount of water vapor to the second air tank 9, close the stop valves 5 and 7. The purpose of this step is to simulate the situation in which the compressed air contains moisture in actual operation.

[0063] Test: Repeat steps 1 and 2 of the "Dryer Function Test" to observe whether water vapor is discharged from the muffler 25 connected to the drainage steam interface C of the dryer 21. If water vapor is discharged, it means that the drainage function of the dryer is normal; if water vapor is not discharged, it is necessary to check whether the dryer is faulty.

[0064] 4. Dryer output power test

[0065] Prepare to Test: Repeat steps 1 and 2 of the “Dryer Function Test.”

[0066] Observe the indicator light: Check whether the output indicator light 26 is lit normally to verify whether the 24VDC power output function of the dryer 21 is normal.

[0067] 5. Dryer continuous operation test

[0068] Prepare to Test: Repeat steps 1 and 2 of the “Dryer Function Test.”

[0069] Set the test time: Set the time for the dryer to run the test continuously, for example, 48 hours. During this period, the control box 15 will continue to control the dryer 21 to switch periodically.

[0070] Evaluation results: After the test, record the count value of counter 18, that is, the actual number of operations of the dryer switching valve. Calculate the theoretical number of operations (test time × 60 times / hour). If the absolute value of the difference between the actual number of operations and the theoretical number of operations is less than 1% of the theoretical number of operations, the dryer maintenance is considered qualified.

[0071] Through the above test items, the various performance indicators of the dryer can be comprehensively evaluated to ensure that it can meet the requirements of actual operation. The test method provided by the present invention is simple to operate, accurate in results, and highly efficient, and can effectively improve the maintenance quality of the dryer and ensure the safe and reliable operation of the maglev train.

Claims

1. A test device for a maglev train air compressor dryer unit, characterized in that: include, a first air storage tank (29), the first air storage tank (29) being connected to the air source output interface (B) of the dryer (21) to be tested, and being used to receive dry air discharged from the air source output interface, a second gas storage tank (9), one end of which is connected to the gas source input interface (A) of the dryer (21) to be tested, The other end is connected to an air inlet valve (4) for introducing dry air and a humidifying atomizing nozzle valve for introducing humidified gas, wherein the air inlet valve (4) and the humidifying atomizing nozzle valve are arranged in parallel. The tested dryer (21) has a drainage steam interface (C), After the humidifying atomizing nozzle valve introduces humidified gas into the second gas storage tank (9), the air inlet valve (4) introduces dry gas into the second gas storage tank (9).

2. The test equipment for the maglev train air compressor dryer unit according to item 1, characterized in that: a second gas storage tank (9), one end of which is connected to the gas source input interface of the dryer (21) to be tested via a first pressure switch (13); The drainage steam interface (C) is connected to a second pressure switch (24).

3. The test equipment for the maglev train air compressor dryer unit according to 2, characterized in that: The second pressure switch (24) is associated with a counter (18), and the counter (18) is connected to the control box (15).

4. The test equipment for the maglev train air compressor dryer unit according to 3, characterized in that: The control box (15) supplies power to the tested dryer (21), and controls the switching valve of the tested dryer (21) through a timing control panel to switch the gas path connection between the adsorption cylinders.

5. The test equipment for the maglev train air compressor dryer unit according to 4, characterized in that: The control box (15) controls the gas path connection between the adsorption cylinders through a timing control panel to perform periodic switching at a set time.

6. The test equipment for the maglev train air compressor dryer unit according to 5, characterized in that: When the measurement is finished, the control box (15) controls the first gas storage tank and the second gas storage tank to release the pressure. During this period, the control box (15) controls the switching of the gas connection between the adsorption cylinders until the pressure drops to the set pressure value.

7. The test equipment for the maglev train air compressor dryer unit according to 5, characterized in that: The drainage steam interface (C) is in communication with the gas source output interface (B), and the capacity of the first gas storage tank (29) is greater than that of the second gas storage tank (9).

8. The test equipment for the maglev train air compressor dryer unit according to 5, characterized in that: The drainage steam interface (C) is connected to the gas source output interface (B), and the conduction pressure of the first pressure switch (13) is lower than the conduction pressure of the second pressure switch (24).

9. The test equipment for the maglev train air compressor dryer unit according to item 1, characterized in that: The air inlet valve (4) and the humidifying atomizing nozzle valve arranged in parallel are both connected to an air inlet (3), and the air inlet (3) outputs air to the air inlet valve (4) and the humidifying atomizing nozzle valve.

10. The test equipment for the maglev train air compressor dryer unit according to item 1, characterized in that: The tested dryer (21) is mounted on a dryer fixing bracket (2), the first gas storage tank (29) is mounted on a test equipment bottom plate (1), and the test equipment bottom plate (1) is fixed to the dryer fixing bracket (2).

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